Route shaping dropped reasoning_details on routes that do not read the array
(Gemini, Vertex, Copilot, custom) before shape_wire_carriers could lift the
private native_assistant record out of it. Every reloaded turn (each gateway
turn, every --resume) lost the signature and flipped the cached prefix. The
private records now survive shaping; the transport still filters them per route.
The field-rejection recorder matched generic phrases ('not allowed', 'is
unsupported'), so a value complaint like 'reasoning_content is not allowed to be
empty' was recorded as a schema rejection and persisted: every later tool turn
then 400'd. Only unknown-field phrasing counts now, a must-echo route never
records reasoning_content, and the recorder runs on chat_completions only.
Also restores the stealth/missingno must-echo pad (f86276d2eb) as a table row.
f691e7b7fb